Robert MacIntyre unleashed an X-rated assessment on the 18th hole at Royal Birkdale during his first round at The Open.The Scottish golfer produced a three-under par 67 on Thursday in Southport.MacIntyre had an X-rated criticism of the final hole at Royal Birkdale on ThursdayGettyIt leaves MacIntyre a shot behind early leaders Sungjae Im and Dan Brown.The 29-year-old ended his day with four birdies, one bogey and 13 pars.X-rated reactionHowever, his score could have been even better had it not been for a wayward approach shot on the final hole.MacIntyre found the fairway off the tee, but saw his second from 242 yards out hook right into the rough next to the green.His furious reaction was captured by a hot mic as he turned to his caddie.He could be heard saying: “Such a s*** golf hole, innit? It really is.”Despite the setback, MacIntyre was able to go up and down to rescue a par to close out his round.His outburst comes just three months after he was reprimanded at the Masters in April.MacIntyre made his feelings known on the 15th green by directing a middle finger towards the course.It came after a quadruple-bogey nine, which contributed to an eight-over par opening round.MacIntyre’s approach shot on the 18th hooked into the rough next to the greenGettyMacIntyre reflectsThe world No.15 will be hoping for more success this weekend after a positive start to the tournament.Reflecting on his first round, MacIntyre explained: “It was a great start, it was the perfect start. Nice tee shot down one that caught the left edge.“Obviously a great second shot, lovely putt, but yes, I felt like I played really well.“A couple of putts I don’t know how they missed, but other than that I felt like it was almost the perfect round of golf with a great scramble at the last.”Already a two-time winner on the PGA Tour, MacIntyre is eyeing his first major championship at Royal Birkdale.His previous best finish at The Open came in 2019 as he finished tied-sixth at Royal Portrush.MacIntyre has admitted he could happily retire if he won The Open this weekendGettyRetirement plansMacIntyre has admitted he would happily retire if he clinched the Claret Jug.He added: “If I won an Open, won any major, if something happened I could happily walk away from the game of golf.“Openly say it, I’ll say it until I’m blue in the face. It would be all my goals that I ever dreamed of complete if I’d done that, but there’s a long way to go.“You’ve got four chances every year so I’m hoping to play the game for somewhat ten years and I’ve got a fair few efforts at that.”MacIntyre begins his second round at 12:25pm on Friday alongside Rickie Fowler and Alex Fitzpatrick.Live commentary from The 154th Open Championship is available on talkSPORT 2 from 7am on Thursday, Friday, Saturday and Sunday.